Rotary motor.



r J. HARMAN.

' ROTARY MOTOR.

' APPLIOATION FILED 00T. 10l 1910.

989,600. Patented Apr. 18, 1911.

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J. HARMAN. ROTARY MOTOR.

APPLICATION FILED 00T. 10, 1910. 989,600. .Patented Apr. 1s,r1911.

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Inf- III I *MMT L mum um j il?? JOSEPH HARMAN, OF BRAINERD, MINNESOTA,ASSIGNOR OF ONE-HALF TO PATRICK E.

MCCABE, OF BRAINERD, MINNESOTA.

ROTARY MOTOR.

esaeoo.

use the same.

This invention relates `to improvements in rotary motors.

One object of t-he invention is to improve and simplify the constructionof motors of this character whereby the efficiency and durability of thesame will be increased.

Another object is to provide an improved construction and arrangement ofcombined steam and exhaust valve by means of which the motor may bequickly and easily reversed. V

With these and other objects in view, the invention consists of certainnovel :features of construction, combination and arrangement of parts aswill be more fully described and particularly pointed out in theappended claim.

In the accompanying drawings: Figure 1 is a vertical longitudinalsectional view of a rot-ary motor constructed in accordance with theinvention; Fig. 2 is a vertical cross section through the live steamside of the motor on the line 2 2 of Fig. 1. Fig. 3 is a similar viewthrough the exhaust side of the motor on the line 3-3 of Fig. 1; Fig. 4is a vertical longitudinal sectional view through the outer casingshowing the inner casing in side elevation; Fig. 5 is a horizontalsectional view of the valve casing and valve showing the position of thelatter when the motor is running inV one direction; Fig. 6 is a similarview showing the position of the valve when the motor is reversed orrunning in the opposite direction; Fig. 7 is a similar view of the valvecasing with the valve removed to more clearly illustrate the arrangementof the steam and exhaustports in the casing.

My improved motor comprises an outer cylindrical casing 1 and an innerconcentrically arranged casing 2 which is of less diameter than theouter casing thus forming between the two casings an annular steam space3 which is divided midway between Specification of Letters Patent.

Application led October 10, 1910.

Patented Apr. 18, 1911.

serial No. 586,347.

the opposite ends or heads of the casing by an annular partition strip4. The dividing strip a separates the space 3 into live steam andexhaust passages a and Z) respectively. In the inner casing 1 is formeda series of steam inlet ports 5 which communicate with the annular livesteam passage a of the space 3 between the inner and outer casing. Inthe opposite side of the inner casing is formed a series of exhaustports 6 which communicate with the annular exhaust passage b of thespace 3 between the casings.

Secured to the opposite heads or ends of the motor are piston guide andblade operating plates 7 with which are revolubly engaged the outer endsof a cylindrical piston 8 which is xedly mounted on a shaft 9 passingthrough the plates 7 and opposite ends or heads of the motor as shown.In each of the plates 7 are formed a plurality of blade operatingnotches 10 the edges of which are inclined as shown. Formed in thepiston 8 is a series of longitudinally disposed slots 11 in each ofwhich is slidably mounted a wing or blade 12 which is provided toreceive the pressure from the expansion of the steam which enters thesteam space between the piston and the inner casing through the steaminlet ports 5.

On the inner side of the inner casing 2 opposite to or in line with thenotches 10 in the plates 7 are substantially triangular wing or bladeoperating abutments 13 in the apices of which are formed longitudinalgrooves 14 and in which are arranged packing strips 15 which bearagainst and form a fluid tight engagement with the outer surface of thepiston 8. Assuming the motor to be running in the direction of thearrows shown in Figs. 2 and 3 of the drawings the steam will enterthrough the live steam ports 5 and will expand between the abutments 13and the adjacent sides of the blades 12 thereby turning the piston. Asthe piston is thus turned and the blades brought opposite to the notches10 and into engagement with the abutments 13 the inclined wall of theabutments will force the blades back into the piston and into engagementwith the notches 10 in the plates 7 and when the Immediately after theblades have passed the abutments the inner edges thereof will be broughtinto engagement with the opposite inclined walls of the notches 10 whichwill again force the blades outwardly through the slots in the pistonand into engagement with the inner wall of the inner casing to form anew steam expansion space between itself and the abutment just passed toreceive the steam entering the inlet port communicating with this space.As the piston moves around and has its blades moved inwardly andoutwardly in the manner described the exhaust steam in the spaces aheadof each of the blades will be forced out of the exhaust ports whichcommunicate with said spaces and the annular exhaust passage Z2 of thespace between the inner and outer casings of the motor so that theexhaust steam does not form any resistance to the forward movement ofthe piston.

On the upper side of the outer casing is arranged a valve casing 16having in its lower end a valve seat provided with two pairs of steaminlet and exhaust ports 17 and 18 which communicate respectively withthe inlet and exhaust passages a and b formed in the space between theinner and outer casings of the motor. Operatively mounted in the valvecasing 16 is a hollow valve 19 which is divided by a transversepartition 20 into a steam inlet side 21 and a steam exhaust side 22.rIhe valve 19 is revolubly mounted in the casing 16 said casing beingclosed at itsupper end by a cover plate 23 in which is formed a steaminlet passage 24 and a steam exhaust passage 25. In the upper edges ofthe valve 19 and the partition 2O are arranged packing strips 26 whichform a fluid tight engagement with the under side of the cover plate asshown. The valve 19 is provided with a centrally disposed operating stem27 which projects upwardly through a bearing opening in the top plate 23of the valve casing and is squared on its upper end to receive a wrenchor handle by means of which the valve may be turned in the casing. Inthe bottom of the valve and on one side of the partition 20 is formed asteam inlet port 28 and in the bottom of the valve on the opposite sideof the partition is formed a steam exhaust port 29. By turning the valvein the proper'direction to bring the inlet and exhaust ports inalinement with the ports in the outer casing of the motor the live steammay be let into one or the other of the passages a or b while the otherpassage will serve as the exhaust passage thus controlling the directionin which the piston is driven and providing for the quick reversal ofthe motor.

From the foregoing description taken in connection with the accompanyingdrawings, the construction and operation of the invention will bereadily understood without requiring a more extended explanation.

Various changes in the form, proportion and the minor details ofconstruction may be resorted to without departing from the principle orsacrificing any of the advantages of this invention as defined in theappended claim.

I-Iaving thus described my invention what I claim is:

A rotary motor comprising an outer casing, an inner casingconcentrically arranged therein to form an annular steam space, saidinner casing having formed therein a series of steam inlet and exhaustpassages communicating with said steam space, an annular dividing stripadapted to separate said space into live and exhaust steam passages, apiston revolubly mounted in said inner casing, a series of bladesslidably mounted in said piston, piston supporting plates secured to theinner ends of the motor casing said plates having formed therein aseries of notches adapted to receive said blades when pushed into thepiston and to project the same and a series of abutments arranged onsaid inner casing and adapted to push said blades into the piston andinto the notches in said piston supporting plates.

In testimony whereof I have hereunto set my hand in presence of twosubscribing wit- IIBSSBS.

JOSEPH HARMAN. Witnesses OLivE S. OLSON, IDA S. CAILsoN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

